NEW MATERIAL:A compound of formula I (R and R' are H or 1W10C alkyl or alkoxyl).

EXAMPLE: 4-Methyl-{trans-4'-[trans-4"-( trans-4'''-ethylcyclohexyl )cyclohexyl]cyclohexyl} benzene.

USE: A component in liquid crystal compositions, capable of exhibiting the liquid crystal phase within a wide temperature range and forming a nematic liquid crystal composition having a low viscosity, and stable to moisture, heat, light and air.

PROCESS: 4-Methoxybromobenzene is reacted with Mg to form a compound of formula II, which is then reacted with a compound of formula III to afford a compound of formula VI. The resultant compound of formula VI is then dehydrated and reduced in the presence of a Raney nickel catalyst, demethylated and catalytically reduced in the presence of an Ru/C catalyst to give a compound of formula V, which is then oxidized in a mixed solution of chromic acid with sufuric acid. A compound of formula VI is then dropped to the oxidation product, and the resultant product is then dehydrated and reduced with H2 in the presence of the Reney nickel catalyst to afford the aimed compound of formula I .